Other non-current liabilities of €624 million (€869 million at 31 December 2011) comprise:

Prepaid income from regulated activities (€281 million) relates to: (i) the non-current portion of payments for balancing and stock replenishment invoiced in 2011 (€164 million) to be returned to service users based on the provisions of Resolution 50/06 of the Electricity and Gas Authority; and (ii) the non-current portion of transportation revenues invoiced in excess of the restriction established by the Regulator and penalties charged to service users that exceeded the committed capacity (€118 million); this amount is to be adjusted based on the provisions of Resolution 166/05 of the Electricity and Gas Authority.

Deferred and prepaid revenue and income (€314 million) refer to: (i) fees for the use of strategic gas withdrawn and not replenished by users under the terms of the Storage Code (€296 million); and (ii) the non-current portion of the prepaid fee for the concession to use fibre-optic cables given to a telecommunications operator (€18 million).

Other liabilities (€26 million) relate essentially to: (i) security deposits paid as a guarantee by users of the balancing service provided as part of the natural gas transportation service (€20 million), stipulated by Resolution ARG/gas 45/11; and (ii) the non-current portion (€5 million) of the greater quantities of fuel gas allocated by users of the transportation service in 2012, pursuant to Resolution ARG/gas 184/09 of the Electricity and Gas Authority, compared with the quantities actually used, which will be adjusted in 2014 by reducing the quantities allocated by users.